Yank Sing, the popular dim sum restaurant in San Francisco’s financial district, was founded by Alice Chan in 1958. There are now two locations of this third-generation family-run restaurant, both creating almost 100 items a day to be rolled out into the dining rooms for diners to choose. Both locations are excellent, but some of our Chinese friends prefer this one, where on weekends, the crowd spills out into the Rincon Atrium. Any conversation about San Francisco's best dim sum is dangerous, but you can easily make a case that this is the city’s best. Either way, complementing the merits of Yank Sing's xiao long bao is well-tread ground. Thin dumpling skin, pursed plump dumplings, a dash of vinegar, perfection. Wait, was that a xiao long bao haiku?